In-cell type touch display device including switching part and method of driving the same

• US 9,285,910 B2
• Filed: 12/27/2013
• Issued: 03/15/2016
• Est. Priority Date: 12/28/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Gyoung-A, Woo, Yoon-Hwan
• Primary Examiner(s): Park, Sanghyuk
• Application Number:
  US14/141,942
• Publication Number:
  US 20140184543A1
• Time in Patent Office: 809 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An in-cell type touch display device includes a panel including a plurality of electrodes, a display driver integrated circuit (IC) and a switching part, the plurality of electrodes being divided into a plurality of groups; and a touch IC generating a touch scan signal and applying the touch scan signal into the switching part, wherein the display driver IC generates a common voltage and applies the common voltage into the switching part, and wherein the switching part applies the common voltage into the plurality of electrodes or sequentially applies the touch scan signal into the electrodes in the plurality of groups according to a driving mode of the panel.

Claims

1. An in-cell type touch display device, comprising:

a panel including a plurality of electrodes, a display driver integrated circuit (IC) and a switching part, the plurality of electrodes being divided into a plurality of groups; and

a touch IC generating a touch scan signal and applying the touch scan signal to the switching part,

wherein the display driver IC generates a common voltage and applies the common voltage to the switching part,

wherein the switching part applies the common voltage to the plurality of electrodes when a driving mode of the panel is a display driving mode, and sequentially applies the touch scan signal to the electrodes in the plurality of groups with respect to each group when a driving mode of the panel is a touch driving mode,

wherein the plurality of groups includes a first group and a second group,

wherein the touch driving mode includes a first touch driving mode and a second touch driving mode next to the first touch driving mode,

wherein the switching part sequentially applies the touch scan signal to the electrodes in the first group when a driving mode of the panel is the first touch driving mode, and sequentially applies the touch scan signal to the electrodes in the second group when a driving mode of the panel is the second touch driving mode,

wherein the display driver IC is configured to;

generate a sync signal for the driving mode of the panel,

generate a control signal for supplying the common voltage to the plurality of electrodes when the sync signal is a first sync signal for the display driving mode, and

sequentially connect the electrodes in the plurality of groups with the touch IC when the sync signal is a second sync signal for the touch driving mode, and

wherein the touch IC detects a self-capacitive type variation of an electrostatic capacitance of each of the plurality of electrodes.

2. The in-cell type touch display device according to claim 1, wherein the panel is divided into a display region and a non-display region, and wherein the plurality of electrodes are formed in the display region, and the display driver IC and the switching part are formed in the non-display region.

3. The in-cell type touch display device according to claim 1, wherein the plurality of electrodes serve as a common electrode when the driving mode of the panel is the display driving mode, and each of the plurality of electrodes serves as a touch electrode when the driving mode of the panel is the touch driving mode.

4. The in-cell type touch display device according to claim 1, wherein the switching part includes a first switching part operating according to the sync signal and a second switching part operating according to the control signal.

5. The in-cell type touch display device according to claim 4, wherein the first switching part is connected to the common voltage generating part and the touch IC,

wherein the first switching part connects the common voltage generating part with the second switching part when the sync signal is the first sync signal for the display driving mode, and the first switching part connects the touch IC with the second switching part when the sync signal is the second sync signal for the touch driving mode,

wherein the second switching part is connected to the first switching part and one electrode of each group, and

wherein the second switching part connects the first switching part with the electrodes when the sync signal is the first sync signal, and the second switching part sequentially connects the first switching part with the electrodes in the plurality of groups when the sync signal is the second sync signal.

6. The in-cell type touch display device according to claim 4, wherein the first switching part includes a plurality of 2:

1 MUXes.

7. The device according to claim 1, wherein the plurality of electrodes and the switching part are directly connected to each other by a plurality of lines.

8. The device according to claim 1, wherein in the first touch driving mode, the switching part does not apply the touch scan signal to the electrodes in the second group while sequentially applying the touch scan signal to the electrodes in the first group, and

wherein in the second touch driving mode, the switching part does not apply the touch scan signal to the electrodes in the first group while sequentially applying the touch scan signal to the electrodes in the second group.

9. A method of driving an in-cell type touch display device including a panel and a touch IC generating a touch scan signal, the panel including a plurality of electrodes divided into a plurality of groups, a display driver IC generating a common voltage, and a switching part applying the common voltage or the touch scan signal into the plurality of electrodes, the touch IC applying the touch scan signal to the switching part, the method comprising:

applying the common voltage to the plurality of electrodes when a driving mode of the panel is a display driving mode; and

sequentially applying the touch scan signal to the plurality of electrodes in the plurality of groups with respect to each group when the driving mode of the panel is a touch driving mode,

wherein the plurality of groups includes a first group and a second group,

wherein the touch driving mode includes a first touch driving mode and a second touch driving mode next to the first touch driving mode, and

wherein the sequentially applying the touch scan signal to the plurality of electrodes in the plurality of groups includes;

sequentially applying the touch scan signal to the electrodes in the first group when a driving mode of the panel is the first touch driving mode; and

sequentially applying the touch scan signal to the electrodes in the second group when a driving mode of the panel is the second touch driving mode,

wherein the display driver IC is configured to;

generate a sync signal for the driving mode of the panel,

generate a control signal for supplying the common voltage to the plurality of electrodes when the sync signal is a first sync signal for the display driving mode, and

sequentially connect the electrodes in the plurality of groups with the touch IC when the sync signal is a second sync signal for the touch driving mode, and

wherein the touch IC detects a self-capacitive type variation of an electrostatic capacitance of each of the plurality of electrodes.

10. The method according claim 9, wherein the switching part includes a first switching part operating according to the sync signal and a second switching part operating according to the control signal, and

wherein the applying the common voltage to the plurality of electrodes includes:

connecting the common voltage generating part with the second switching part when the first switching part receives the first sync signal for the display driving mode; and

connecting the first switching part with the electrodes when the second switching part receives the first sync signal for the display driving mode.

11. The method according claim 9, wherein the switching part includes a first switching part operating according to the sync signal and a second switching part operating according to the control signal, and

wherein the sequentially applying the touch scan signal to the plurality of electrodes in the plurality of groups includes:

connecting the touch IC with the second switching part when the first switching part receives the second sync signal for the touch driving mode; and

sequentially connecting the first switching part with the plurality of electrodes in the plurality of groups when the second switching part receives the control signal according to the second sync signal for the touch driving mode.

12. The method according to claim 9, wherein in the first touch driving mode, the touch scan signal is not applied to the electrodes in the second group while the touch scan signal is sequentially applied to the electrodes in the first group, and

wherein in the second touch driving mode, the touch scan signal is not to the electrodes in the first group while the touch scan signal is sequentially applied to the electrodes in the second group.

13. An in-cell type touch display device, comprising:

a panel including a plurality of electrodes, a display driver integrated circuit (IC) and a switching part, the plurality of electrodes being divided into a plurality of groups including a first group of electrodes and a second group of electrodes; and

a touch IC generating a touch scan signal and applying the touch scan signal to the switching part,

wherein the display driver IC generates a common voltage and applies the common voltage to the switching part,

wherein the switching part applies the common voltage to the plurality of electrodes when a driving mode of the panel is a display driving mode, and sequentially applies the touch scan signal to the electrodes in the plurality of groups with respect to each group when a driving mode of the panel is a touch driving mode,

wherein the touch driving mode includes a first touch driving mode and a second touch driving mode next to the first touch driving mode,

wherein the switching part sequentially applies the touch scan signal to the electrodes in the first group when a driving mode of the panel is the first touch driving mode, and sequentially applies the touch scan signal to the electrodes in the second group when a driving mode of the panel is the second touch driving mode, such that the touch scan signal is applied to all the electrodes of the panel in the touch driving mode mode,

wherein the in-cell type touch display device is a self-capacitive type in which each of all the plurality of electrodes serves as a touch electrode when the driving mode of the panel is the touch driving mode.